The film poster is based on the film Peeping Tom(1960) by Michael Powell and incorporates an actual painting blended with text formatting on the computer to achieve the final product. It aims to intrigue and leave the audience guessing through the use of a clever tagline and a minimalistic style that gives only enough about the movie away. It also benefits from a high contrast to create a striking imagethat catches the eye based on the color scheme.

The poster is a gimmick idea in which someone looking at the poster is looking in a circular mirror. I think you see the connection.